Determination of phosphorus in organic compounds: A new micro procedure

S., T.; McKinley, J. D.

doi:10.1007/bf01215760

Cited by 26 publications

(9 citation statements)

References 14 publications

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“…Phosphorus elemental analysis was carried out by digesting 20 mg of resin with 15 mL of perchloric/nitric acid (2:1 v/v) solution followed by reaction with amidol and ammonium molybdate …”

Section: Methodsmentioning

confidence: 99%

Synthesis and Ion-Complexing Properties of a Novel Polymer-Supported Reagent with Diphosphonate Ligands

et al. 1996

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A new chelating resin with diphosphonate groups has been synthesized from the tetraethyl ester of 1,1-vinylidenediphosphonic acid. Comonomers such as acrylonitrile allow the sterically hindered monomer to be incorporated into the polymer network. A copolymer was prepared by suspension polymerization in high yield with diphosphonate, acrylonitrile, and styrene in the monomer solution at a 4.5:1:3.1 weight ratio and 5 wt % divinylbenzene as the cross-link agent. Bifunctionality enhances metal ion complexation kinetics. The diphosphonate ligands are selective chelators, while sulfonic acid ligands covalently bound to the phenyl groups enhance the accessibility of metal ions in the polymer matrix. The complexing ability of the polymer is studied with Eu(III) as the target ion in 0.04−4.0 N HNO3 solutions in both the presence and absence of 0.40 N NaNO3. A sulfonic acid ion exchange resin complexes 14.3% Eu(III) while the diphosphonate-based polymer complexes 96.5% from a 1 N HNO3/0.4 N NaNO3 solution.

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“…Phosphorus elemental analysis was carried out by digesting 20 mg of resin with 15 mL of perchloric/nitric acid (2:1 v/v) solution followed by reaction with amidol and ammonium molybdate …”

Section: Methodsmentioning

confidence: 99%

Synthesis and Ion-Complexing Properties of a Novel Polymer-Supported Reagent with Diphosphonate Ligands

et al. 1996

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“…Viscosities were measured using a Brookfield viscometer, Model RVF, number 7 spindle at 20 rpm. Per cent phosphorus was determined using a modified colorimetric method (Ma and McKinley, 1953).…”

Section: Transesterification Of Dialkyl Phosphonopropionates With Car...mentioning

confidence: 99%

“…rigid polyurethane foam insulation, has led to the development of many new phosphorus-containing polyethers and polyesters. Piechota (1964Piechota ( , 1965 has shown the value of phosphorus compounds in such fire-retardant systems, and that phosphorus-containing rigid polyurethane foams develop an optimum flame protection at a phosphorus content of 1.5%. In general, chemically bound phosphorus compounds are preferred over nonreactive additive types.…”

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confidence: 99%

Properties and Stability of Fire-Retardant Rigid Polyurethane Foams from Phosphonopropionate Polyols

Quinn¹

1970

Product R&D

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gave a , of 0.002, whereas at A = 0 (pure ra-butylamine) the observed viscosity (6 cps) gave a , of 0.157. From the specific gravity of the amine (0.74) and the 1 to 1 complex (0.80), 0i for 2 to 1 and 3 to 1 mixtures gave theoretical values of 0.019 and 0.033, respectively, compared to observed values of 0.031 and 0.052. The viscosity lowering as calculated from Equation 2 is 32 cps (observed 60 cps) for the 2 to 1 mixture and 20 cps (observed 30 cps) for the 3 to 1 mixture. This deviation from observed values is not unexpected (Irany, 1943), since these liquid mixtures do not form an ideal solution and neither liquid is nonpolar.Within the butylamine, the viscosity of the adduct increased from -> iso-> sec-> ¿erí-butylamine. This difference in viscosity appears to be too large to explain

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“…In Schaffer's method the phosphomolybdic acid is extracted from the reaction mixture with octyl alcohol and determined by capillary spectrophotometry. A new microprocedure for phosphorus has been proposed by Ma and McKinley (122).…”

Section: Other Elementsmentioning

confidence: 99%